Determinants of positive skin tests to dust mite and to cat fur derived from logistic regression
| n (%) | Crude OR*(95% CI) | n (%) | Adjusted OR*(95% CI) | p value** | |
|---|---|---|---|---|---|
| *Odds ratios (and 95% confidence intervals). | |||||
| **Likelihood ratio test. | |||||
| Dust mite sensitisation | |||||
| First born | 234 (42.4) | 1.89 (1.06 to 3.34) | 215 (43.4) | 2.06 (1.05 to 4.06) | 0.035 |
| Maternal age | 551 | 1.07 (1.01 to 1.13) | 496 | 1.10 (1.02 to 1.18) | 0.008 |
| Breast feeding | 347 (62.9) | 1.73 (0.91 to 3.27) | 319 (64.3) | 1.88 (0.90 to 3.95) | 0.084 |
| Anyone smoking at age 1 | 235 (42.6) | 1.58 (0.90 to 2.79) | 198 (39.9) | 2.67 (1.39 to 5.12) | 0.003 |
| Paternal atopy | 207 (41.3) | 2.80 (1.53 to 5.15) | 207 (41.7) | 3.20 (1.68 to 6.09) | <0.001 |
| Quintile of Der p 1 (low) exposure | |||||
| 1 | 109 (20.0) | 1.00 | 97 (19.6) | 1.00 | 0.147 |
| 2 | 109 (20.0) | 2.95 (1.11 to 7.86) | 98 (19.8) | 2.92 (1.04 to 8.17) | |
| 3 | 110 (20.2) | 2.10 (0.76 to 5.82) | 100 (20.2) | 1.98 (0.68 to 5.80) | |
| 4 | 109 (20.0) | 2.12 (0.77 to 5.88) | 100 (20.2) | 2.09 (0.71 to 6.17) | |
| 5 | 109 (20.0) | 1.00 (0.31 to 3.20) | 101 (20.4) | 1.02 (0.30 to 3.44) | |
| Cat fur sensitisation | |||||
| First born | 233 (42.3) | 1.95 (1.07 to 3.58) | 204 (44.4) | 2.55 (1.27 to 5.14) | 0.007 |
| Social class (I/II) | 146 (29.4) | 2.13 (1.12 to 4.05) | 140 (30.5) | 2.14 (1.08 to 4.25) | 0.032 |
| Sex | 295 (53.5) | 1.95 (1.03 to 3.70) | 246 (53.6) | 2.15 (1.04 to 4.45) | 0.034 |
| Paternal atopy | 206 (41.2) | 1.81 (0.97 to 3.37) | 195 (42.5) | 1.91 (0.96 to 3.80) | 0.064 |
| Quintile of Fel d 1 (low) exposure | |||||
| 1 | 109 (20.0) | 1.00 | 78 (17.0) | 1.00 | 0.592 |
| 2 | 109 (19.8) | 0.88 (0.31 to 2.50) | 90 (19.6) | 0.93 (0.27 to 3.27) | |
| 3 | 110 (20.2) | 1.40 (0.54 to 3.63) | 91 (19.8) | 1.70 (0.54 to 5.33) | |
| 4 | 109 (20.0) | 1.71 (0.68 to 4.31) | 97 (21.1) | 1.77 (0.57 to 5.50) | |
| 5 | 109 (20.0) | 1.00 (0.36 to 2.77) | 103 (22.4) | 1.00 (0.30 to 3.35) | |